Shaker grate



C. W. HALL.

SHAKER GRATE; APPLICATION FILED MAR. 14, 1918.

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attozwaq C. W. HALL;

SHAKER GRATE.

I APPLICATION FILED MAR. I4, 19H]. 1,307,777. Patented June 24, 1919. 2 SHEETS-SHEET 2.

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SHAKER-GRATE.

Specification of Letters Patent. Patented J 11116 24;, 1919.

application filed March 14, 1918. Serial No. 222,397.

To all whom it may concern:

Be it known that I, Cr'IAnLEs W. HALL, citizen of the United States, residing at Keystone, in the county of McDowell and State of West Virginia, have invented certain new and useful Improvements in Shaker-Grates, of which the following is a specification.

This invention. relates to furnace grates and more particularly to improvements in grates of the shaker type.

It is the primary aim of the present invention to provide in a furnace grate of the type mentioned, a novel construction of the dead plate designed to prolong the life of the grate and to be so constructed and arranged as to be prevented from sagging or being otherwise rendered incapable of properly. supporting the bearing bars of the grate. Ordinarily the dead plates of furnace rates of the type mentioned are so locate as to be exposed to theintense heat in the fire box and as a result the dead plates soon sag or become otherwise distorted, thereby impairing the eificiency of the grate as a whole. In an efiort to overcome this disadvantage it has been proposed to provide supports for these plates extending downwardly into the the ash pit and to the fioor of the said pit, but these supports interfere with cleaning of the ash pit/and are otherwise undesirable. Therefore, the present invention has as its object to provlde a dead plate so constructed as to support the hearing bars of the grate in a substantial manner and against any lateral play whatsoever, the said dead plate being furthermore so located and mounted within the fire box as not to be subjected to the direct heat from the burning fuel.

The invention also has as a further object to provide a novel construction and arrangement of the bearing bars for the grate seca; be noted that oneof the lugs 10 islocated at i each. end of the plate rearwardly of the re- Figure 1 is a erspective. view of the tions.

In the accompanying drawings:

shaker grate emboc ying the present invention removed from the furnace;

Fig. 2 is a vertical longitudinal sectional View through the grate; t

Fig. 3 is a vertical transverse sectional view through the grate Fig. 4 is a perspective view looking at the under side of the dead plate of the grate.

In the drawings, while the grate is illustrated as removed from. the furnace, in a sense, nevertheless there is illustrated a por tion of the front of the furnace indicated in general by the numeral 1, the said front having the usual door openings 2 leading to the ash pit and the door opening 3 com- Inunicating with the fire 'box. The dead plate of the grate is indicated in general by the numeral 4 and the said plate is preferably 1n the nature of an integral casting of a length to extend the entire width of the a rear side of the front 1 of the furnace. The

upper and under faces of the dead plate are located in parallel planes and are flat, and upon its under side adjacent each end the dead plate is formed with a reinforcing boss 5 which extends inwardly from the for- Ward edgeof the plate and terminates about midway between the forward and rear edges of the said plate. A similar reinforcing boss 6 is formed upon the under side of the plate midway between the bosses 5 and the plate is formed in its upper side with seats '7 and8 located respectively above the reinforcing bosses 5 and 6. The. seats 7 and 8 open through the forward edge of the plate and through the upper face thereof and are designed to receive the forward ends of the bearing bars of thegrate, as will be presently described. The seats 7 and 8, in shape, are preferably rectangular and it will be understood that by the provision of the bosses 5 and 6 the dead plate 4 is suitably reinforced at the points oflocation of the i said seats. By reference to Fig. 2 of the drawings it will be observed that the dead plate is to be positioned with its rear edge ment of the plate to the said. furnace front at suitable intervals with depending lugs 10 and 11. By reference to Fig. 4: it will abutting against the face offthe furnace front 1, and in order to provide for attachspective boss 5 and one midway between the ends of the plate and rearwardly of the boss 6, the lugs 11 being located between the lugs 10. and all of the lugs being designed to rest or seat firmly against the inner face ofthe the dead plate 4:, it is formed upon its under side with an integral downwardly extending flange 5 which extends longitudinally of the said plate near the forward edge thereof and between the bosses 5 and 6. The numeral 13 indicates a bridge wall within the furnace, and the rearends of the bearing bars are built into this wall and supported thereby.

In supporting the grate sections there are provided two side and one intermediate bearing bars indicated, respectively, by the numerals 17 and 18. Each of the bearing bars is substantially of truss formation to provide against sagging and the bars are formed at their ends with extensions 19 and 20, respectively, which extensions are rectangular 'in form. By reference to Fig. 3 it will be observed that the bearing bar 18 has the form of the two side'bearing bars I? placed face to face, and in fact in casting the bearing bar 18 I dispose side by side the two patterns in the use of which the side bars 17 are cast and thus not only save the expense of a separate pattern, but also properly increase the dimensions of the "-intermediate bar as the same is required to support the adjacent ends of both sets of grate sections In other words, while the bar 18 is of the same general contour as the bars 17, it is of a double thickness as also are its'projecting ends 20. Referring now to Fig.1 of the drawings it will be observed that the projecting ends 19 and 20 at the rear of the bearingbars are built into the bridge wall 13 as previously stated. Also by reference to the said figure it will be observed that the projections '19 and 20 at the forward ends of the bearing bars are seated, respectively, in the seats 7 and 8 in b the dead plate and in such a manner that the upper sides of the bars will be flush with the upper face of the said plate and the bars at their forward ends will be held against relativelateral displacement. At suitable intervals the bearing bars 17 and 18 are formed in their upper "sides with trunnion bearings or recesses 23 to receive trunnions 24 at the ends of the grate-sections, the sections extending transversely between the intermediate bearing bar 18 and the two side bars 17 The trunnions 24 at the outer or relatively remote ends of the sections rest in the bearings 23 in the bearing bars'17, whereas the trunnions atfthe inner or adjacent ends of the grate sections rest in the bearings] in the bearing bar 18, these latter bearings being, of course, substantially twice the length of the bearings in the bars 17 trunnions of corresponding grate sections of the two sets. 7 Inasmuch as the grate sections in, themselves may be of any of the' ordinary forms, it is not thought necessary to specifically describe the same, it being sufficient to note that the said sections, which 1 so that each receives the ends of the arms 26 and connected by a link 28 with a suitable shaking lever 29 mounted upon the furnace front.

From the foregoing description of the invention it will be understood that there is provided, in a grate of the type mentioned, a dead plate which extends the entire width of the furnace front, which is so mounted in place as to obviate the employment of supportings extending downwardly into the ash pit, which is so located as to lie forwardly of the bed of burning fuel upon the grate, and is, consequently, not subjected to the direct heat from the fuel, and, which supports the forward ends of the bearing bars for the grate sections in a substantial man ner and effectually prevents rattling of the bars and the lateral displacement of their said forward ends.

Having thus described the invention, what is claimed as new is: 1

1. In a furnace, the combination with a front, of a dead plate secured to the inner side of the furnace front and provided in ts upper face at its forward edge with spaced seats opening therethrough, transverse bosses arranged beneath the seats, bearing bars having reduced portions fitting within the seats and provided with vertical shoulders bearing against the adjacent bosses, and grate sections journaled in said earing bars.

2. In a furnace, the combination with a front, of a dead plate having one longitudinal edge thereof provided with depending perforated lugs bearing against the inner side of said front and provided in its upper face at its forward edge opening through said edge and immediately below the seats with transverse bosses, bearing bars having reduced portions fitting in said seats and provided with vertical shoulders bearing against the adjacent bosses, grate sections journaled in the bearing bars, and fastening devices extending through the furnace front and through the perforations in the lugs for securing the dead plate in position on the furnace front.

3. In a furnace, the combination with a front, of a dead plate having a fiat upper surface and provided at its rear longitudinal edge with depending perforated lugs and at its forward longitudinal edge with 1 spaced seats terminating short of the lugs, said plate being provided on its lower face and beneath the seats with transverse bosses connected by a longitudinal rib, bearing bars with spaced seats 110 aving reduced portions fitting within the seats and provided with vertical shoulders bearing against the adjacent faces of the bosses, grate sections journaled in the bearing bars, and fastening devices extending through the front of the furnace and through the perforations in the lugs for securing the dead plate in position on the furnace front.

4;. In a furnace, the combination with a front, of a dead plate bearing against the inner side of the furnace front and provided at one longitudinal edge thereof with spaced depending perforated lugs and at its other longitudinal edge with terminal and intermediate seats opening through said longitudinal edge and'the top of the plate, the intermediate seat being approximately twice the width of the terminal seats, transverse bosses arranged on the lower face of the plate and connected by a longitudinal rib, said bosses having their forward edges disposed flush with the forward edge of the dead a plate, bearing bars having reduced portions fitting in said seats and provided with vertical shoulders bearing against the adjacent faces of the transverse bosses, grate sections journaled in the bearing bars, and fastening devices extending through the furnace front and through the perforations in the depend ing lugs for securing the dead plate in position on said furnace front.

5. As an article of manufacture, a dead plate for furnace grates comprising an elongated body portion having a flat upper surface and provided with terminal and intermediate seats opening through one longitudinal edge of the plate and terminating short of the other longitudinal edge thereof, the intermediate sea-t being approximately twice the width of the terminal seats,there being transverse reinforcing bosses arranged beneath the seats and of the same length thereof with their outer faces disposed flush with the adjacent longitudinal edge of the plate, longitudinal ribs connecting the transverse bosses and spaced inwardly from the forward longitudinal edge of the plate and lugs depending from the bottom of the plate at the rear longitudinal edge thereof, certain of said lugs being provided with transverse openings for the reception of fastening devices.

In testimony whereof I aiiix my signature.

CHARLES W. HALL. [L. s.]

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. G. 

